发明授权
- 专利标题： Microporous polyolefin membrane, and method of producing the same
- 专利标题（中）： 微孔聚烯烃膜及其制造方法
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申请号： US12314602申请日： 2008-12-12
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公开(公告)号： US07815825B2公开(公告)日： 2010-10-19
- 发明人: Hidehiko Funaoka , Kotaro Takita , Norimitsu Kaimai , Shigeaki Kobayashi , Koichi Kono
- 申请人： Hidehiko Funaoka , Kotaro Takita , Norimitsu Kaimai , Shigeaki Kobayashi , Koichi Kono
- 申请人地址： JP Tokyo
- 专利权人： Tonen Chemical Corporation
- 当前专利权人： Tonen Chemical Corporation
- 当前专利权人地址： JP Tokyo
- 代理机构： Kratz, Quintos & Hanson, LLP
- 优先权： JP10-294641 19981001; JP10-294642 19981001
- 主分类号： B29C47/78
- IPC分类号： B29C47/78 ; B01D71/26 ; H01M2/16
摘要：
The present invention provides a microporous polyolefin membrane of high permeability and novel structure, and also provides a method of producing the same, wherein its average pore size is gradually decreases from at least one membrane surface towards its center. The method of producing the microporous polyolefin membrane comprises the steps of extruding the solution, composed of 10 to 50 weight % of (A) a polyolefin having a weight-average molecular weight of 5×105 or more or (B) a composition containing this polyolefin and 50 to 90 weight % of a solvent, into a gel-like formed article and removing the solvent therefrom, wherein a treatment step with a hot solvent is incorporated.
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